- E-mailgunnar.bratbak@uib.no
- Phone+47 55 58 26 58
- Visitor AddressThormøhlens gate 53 A/B5006 Bergen
- Postal AddressPostboks 78035020 Bergen
The key words of my research are:
- Structure and function of marine microbial ecosystems,
- Carbon and nutrient flow in the microbial food web.
- Microbial population dynamics and diversity.
- The ecological significance of virus in the ocean.
Academic article
- (2023). The summer bacterial and archaeal community composition of the northern Barents Sea. Progress in Oceanography. 1-9.
- (2023). Seasonality of the bacterial and archaeal community composition of the Northern Barents Sea. Frontiers in Microbiology. 14 pages.
- (2023). Interannual differences in sea ice regime in the north-western Barents Sea cause major changes in summer pelagic production and export mechanisms. Progress in Oceanography. 22 pages.
- (2023). Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux. Progress in Oceanography. 28 pages.
- (2023). Differential toxicity of bioorthogonal non-canonical amino acids (BONCAT) in Escherichia coli. Journal of Microbiological Methods. 6 pages.
- (2022). Multiomics in the central Arctic Ocean for benchmarking biodiversity change. PLoS Biology. 6 pages.
- (2022). First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn. Biogeosciences. 5449-5482.
- (2021). Removal of large viruses and their dispersal through fecal pellets of the appendicularian Oikopleura dioica during Emiliania huxleyi bloom conditions. Limnology and Oceanography. 3963-3975.
- (2021). Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean. Frontiers in Marine Science. 24 pages.
- (2021). How microbial food web interactions shape the arctic ocean bacterial community revealed by size fractionation experiments. Microorganisms. 1-21.
- (2021). Flow Cytometric Analysis of Bacterial Protein Synthesis: Monitoring Vitality After Water Treatment. Frontiers in Microbiology. 13 pages.
- (2021). An 18S V4 rDNA metabarcoding dataset of protist diversity in the Atlantic inflow to the Arctic Ocean, through the year and down to 1000 m depth. Earth System Science Data. 4913-4928.
- (2020). Reproducing the virus-to-copepod link in Arctic mesocosms using host fitness optimization. Limnology and Oceanography.
- (2020). Lateral gene transfer of anion-conducting channelrhodopsins between green algae and giant viruses. Current Biology.
- (2020). Bioorthogonal Non-canonical Amino Acid Tagging Combined With Flow Cytometry for Determination of Activity in Aquatic Microorganisms. Frontiers in Microbiology. 11 pages.
- (2018). Spatiotemporal dynamics of ammonia-oxidizing Thaumarchaeota in Distinct Arctic water masses. Frontiers in Microbiology. 13 pages.
- (2018). Seasonality of the physical and biogeochemical hydrography in the inflow to the Arctic Ocean through Fram Strait. Frontiers in Marine Science. 1-16.
- (2018). Seasonality drives microbial community structure, shaping both eukaryotic and prokaryotic host–viral relationships in an Arctic marine ecosystem. Viruses. 1-22.
- (2018). Seasonal and annual variability in the phytoplankton community of the Raunefjord, west coast of Norway from 2001-2006. Marine Biology Research. 421-435.
- (2018). Is the virus important? And some other questions. Viruses. 1-4.
- (2018). Bacterial response to permafrost derived organic matter input in an Arctic fjord. Frontiers in Marine Science. 1-12.
- (2018). Bacterial community composition responds to changes in copepod abundance and alters ecosystem function in an Arctic mesocosm study. The ISME Journal. 2694-2705.
- (2017). Viruses on the menu: The appendicularian Oikopleura dioica efficiently removes viruses from seawater. Limnology and Oceanography. S244-S253.
- (2017). Viruses on the menu: The appendicularian Oikopleura dioica efficiently removes viruses from seawater. Limnology and Oceanography.
- (2017). Seasonal variations in C:N:Si:Ca:P:Mg:S:K:Fe relationships of seston from Norwegian coastal water: Impact of extreme offshore forcing during winter-spring 2010. Marine Chemistry. 1-12.
- (2017). Seasonal dynamics of haptophytes and dsDNA algal viruses suggest complex virus-host relationship. Viruses. 18 pages.
- (2017). High-Flow-Rate Impinger for the Study of Concentration, Viability, Metabolic Activity, and Ice-Nucleation Activity of Airborne Bacteria. Environmental Science and Technology. 11224-11234.
- (2017). Dampened copepod-mediated trophic cascades in a microzooplankton-dominated microbial food web: A mesocosm study. Limnology and Oceanography. 1031-1044.
- (2017). Changes in marine prokaryote composition with season and depth over an Arctic polar year. Frontiers in Marine Science.
- (2016). Synechococcus in the Atlantic Gateway to the Arctic Ocean. Frontiers in Marine Science.
- (2015). Tsv-N1: A novel DNA algal virus that infects tetraselmis striata. Viruses. 3937-3953.
- (2015). On the progress of understanding algal viruses. Perspectives in Phycology. 65-67.
- (2015). Contrasting response to nutrient manipulation in Arctic mesocosms are reproduced by a minimum microbial food web model. Limnology and Oceanography. 360-374.
- (2015). Characterisation of three novel giant viruses reveals huge diversity among viruses infecting Prymnesiales (Haptophyta). Virology. 180-188.
- (2013). Maximum in the middle : nonlinear response of microbial plankton to ultraviolet radiation and phosphorus. PLOS ONE. 11 pages.
- (2013). Genomic sequence and analysis of EhV-99B1, a new coccolithovirus from the Norwegian fjords. Intervirology. 60-66.
- (2013). Effect of increased pCO(2) on phytoplankton-virus interactions. Biogeochemistry. 391-397.
- (2012). Mg2+ as an indicator of nutritional status in marine bacteria. The ISME Journal. 524-530.
- (2012). An unaccounted fraction of marine biogenic CaCO3 particles. PLOS ONE. 6 pages.
- (2011). Virus infection disturbs cyclin expression, leading to cell cycle arrest in the unicellular marine algae Emiliania huxleyi and Chrysochromulina ericina. African Journal of Microbiology Research. 1801-1807.
- (2011). Two new subfamilies of DNA mismatch repair proteins (MutS) specifically abundant in the marine environment. The ISME Journal. 1143-1151.
- (2011). The plankton community in Norwegian coastal waters-abundance, composition, spatial distribution and diel variation. Continental Shelf Research. 1500-1514.
- (2011). Effects of virus infection on expression of cell cycle regulatory proteins in the unicellular marine algae Emiliania huxleyi. Acta Oceanologica Sinica. 89-95.
- (2011). Diversity of airborne bacteria in samples collected using different devices for aerosol collection. Aerobiologia. 107-120.
- (2011). Characterisation of the coccolithovirus intein. Marine Genomics. 1-7.
- (2008). Response of marine viral populations to a nutrient induced phytoplankton bloom at different pCO2 levels. Biogeosciences. 523-533.
- (2008). Phylogenetic analysis of members of the Phycodnaviridae virus family, using amplified fragments of the major capsid protein gene. Applied and Environmental Microbiology. 3048-3057.
- (2008). Marine mimivirus relatives are probably large algal viruses. Virology Journal. 8 pages.
- (2008). Counterintuitive carbon-to-nutrient coupling in an Arctic pelagic ecosystem. Nature. 387-391.
- (2007). Phaeocystis and its interaction with viruses. Biogeochemistry. 201-215.
- (2007). Molecular dynamics of Emiliania huxleyi and cooccurring viruses during two separate mesocosm studies. Applied and Environmental Microbiology. 554-562.
- (2006). Variability in microbial population dynamics between similarly perturbed mesocosms. Journal of Plankton Research. 783-791.
- (2005). The marine algal virus PpV01 has an icosahedral capsid with T=219 quasisymmetry. Journal of Virology. 9236-9243.
- (2004). Spring phytoplankton bloom dynamics in Norwegian coastal waters: Microbial community succession and diversity. Limnology and Oceanography. 180-190.
- (2004). Spring phytoplankton bloom dynamics in Norwegian coastal waters: Microbial community succession and diversity. Limnology and Oceanography. 180-190.
- (2004). Discovery of a dsRNA virus infecting the marine photosynthetic protist Micromonas pusilla. Virology. 280-291.
- (2004). Abundance and dynamics of free flagellate scales in marine costal ecosystems. Aquatic Microbial Ecology. 55-62.
- (2003). Virioplankton community structure along a salinity gradient in a solar saltern. Extremophiles. 347-351.
- (2003). Stable coexistence in marine algal host-virus systems. Marine Ecology Progress Series. 27-35.
- (2003). Effects of ultraviolet radiation on marine virusphytoplankton interactions. FEMS Microbiology Ecology. 279-289.
- (2002). Isolation and characterization of a virus that infects Emiliania huxleyi (Haptophyceae). Journal of Phycology. 767-774.
- (2002). Flow cytometric Analysis of an E. Huxleyi bloom terminated by viral infection. Aquatic Microbial Ecology. 110-124.
- (2002). Elemental composition (C,N,P)and cell volume of exponentially growing and nutrient limited bacterioplankton. Applied and Environmental Microbiology. 2965-2971.
- (2002). Cell cycle dependent virus production in marine phytoplankton. Journal of Phycology. 338-343.
- (2001). Population dynamics and diversity of phytoplankton, bacteria and viruses in a seawater enclosure. Marine Ecology Progress Series. 47-57.
- (2001). Microbial population dynamics and diversity during a bloom of the marine coccolithophorid Emiliania huxleyi (Haptophyta). Marine Ecology Progress Series. 39-46.
- (2001). Isolation and characterization of two viruses with large genome size infecting Chrysochromulina ericina (Prymneriophyceae) and Pyramimonas orientalis (Prasinophyceae). Virology. 272-280.
- (2001). Flow cytometric analysis of phytoplankton viability following viral infection. Aquatic Microbial Ecology. 157-166.
- (2001). Effects of concentrated viral communities on photosynthesis and community composition of cooccurring benthic microalgae and phytoplankton. Aquatic Microbial Ecology. 1-10.
- (2000). Virus rule the waves - the smallest and most abundant members of marine ecosystems. Microbiology Today. 171-173.
- (2000). Temporal variability of viruses, bacteria, phytoplankton and zooplankton in the western English Channel off Plymouth. MANGLER.
- (2000). Flow cytometric detection of viruses. Journal of Virological Methods. 175-182.
- (1999). Flow cytometric analysis of virus infection in two marine phytoplankton species, Micromonas pusilla (Prasinophyceae) and Phaeocystis pouchetii (Prymnesiophyceae). Journal of Phycology. 941-948.
- (1999). Enumeration of Marine Viruses in Culture and Natural Samples by Flow Cytometry. Applied and Environmental Microbiology. 45-52.
- (1998). Virus production in Phaeocystis pouchetii and its relation to host cell growth and nutrition. Aquatic Microbial Ecology. 1-9.
- (1998). Virus production in Phaeocystis pouchetii and its relation to host cell growth and nutrition. Aquatic Microbial Ecology. 1-9.
- (1998). Viral lysis of Phaeocystis pouchetii and bacterial secondary production. Aquatic Microbial Ecology. 11-16.
- (1998). Viral lysis of Phaeocystis pouchetii and bacterial secondary production. Aquatic Microbial Ecology. 11-16.
- (1998). Elevated production of dimethylsulfide resulting from viral infection of cultures of <EM>Phaeocystis pouchetii</EM>. Limnology and Oceanography. 1389-1393.
- (1997). Occurrence of virus-like particles in the Dead Sea. Extremophies. 143-149.
- (1997). Bacterial population dynamics in a meromictic lake. Applied and Environmental Microbiology. 2181-2188.
- (1996). Viral control of Emiliania huxleyi blooms? Journal of Marine Systems. 75-81.
- (1996). The elemental composition of bacteria: a signature of growth conditions? Marine Pollution Bulletin. 3-9.
- (1996). Isolation and characterization of a virus infecting Phaeocystis pouchetii (Prymnesiophyceae). Journal of Phycology. 923-927.
- (1996). Isolation and characterisation of a virus infecting Phaeocystis pouchetii (Haptophyceae). Journal of Phycology. 923-927.
- (1996). Factors influencing the loss of bacteria in preserved seawater samples. Marine Ecology Progress Series. 305-310.
- (1996). Dynamics of virus abundance in coastal seawater. FEMS Microbiology Ecology. 263-269.
- (1995). Viral activity in relation to Emiliania huxleyi blooms: a possible mechanism of DMSP release? Marine Ecology Progress Series. 133-142.
- (1995). Viral activity in relation to Emiliania huxleyi blooms: a possible mechanism of DMSP release? Marine Ecology Progress Series. 133-142.
- (1995). Nutritional enrichment of a microbial community: The effects on activity, elemental composition, community structure and virus production. FEMS Microbiology Ecology. 123-134.
- (1994). Determination of bacterial cell number and cell volume by means of flow cytometer, transmission electron microscopy, and epifluorescene microscopy. Journal of Microbiological Methods.
- (1993). Viral mortality of the marine algae Emiliania huxleyi (Haptophyceae) and termination of algal blooms. Marine Ecology Progress Series. 39-48.
- (1993). Viral mortality of the marine alga Emiliania huxleyi (Haptophyceae) and termination of algal blooms. Marine Ecology Progress Series. 39-48.
- (1992). Incorporation of viruses into the budget of microbial C-transfer. A first approach. Mar.Ecol.Prog.. 273-280.
- (1991). Production and decay of viruses in aquatic environments. Marine Ecology Progress Series. 205-212.
- (1990). Viruses as Partners in Spring Bloom Microbial Trophodynamics. Applied and Environmental Microbiology. 1400-1405.
- (1990). Virus: Spiller de noen økologisk rolle? Naturen. 148-152.
- (1990). Enumeration and biomass estimation on planktonic bacteria and viruses by transmission electron microscopy. Applied and Environmental Microbiology. 352-356.
- (1989). High abundance of viruses found in aquatic environments. Nature. 467-468.
- (1989). High abundance of viruses found in aquatic environments. Nature. 6233-6234.
Lecture
- (2021). Vital and all over the place – A neglected group of frenemy viruses.
- (2017). A year in the microbial life of a changing Arctic Ocean.
- (2010). Use of flow cytometry in air and marine microbiological research.
Popular scientific lecture
- (1994). Viruses - the new players in the game...
- (1994). Virus og bakterier sin økologiske rolle i akvatiske miljøer.
- (1994). Virus i vann.
- (1994). The possible impact of viruses on marine food webs.
- (1994). The ecological role of virus.
- (1994). Oppdagelsen av marine virus.
- (1993). Carbon budget in the microbial/viral loop.
Academic lecture
- (2024). Nansen vs. Amundsen Basin: Constrasting physico-chemical properties and biota composition to inform management.
- (2023). Ranges of Annual Production in the Barents Sea along Environmental Gradients.
- (2023). PERSISTENT VIRUS PRODUCTION BY PHYTOPLANKTON.
- (2023). Omlegging fra tradisjonelle forelesninger til studentaktiv læring – eksempel fra et grunnemne i biolog.
- (2023). Increased organic matter input. Testing bacterial responses in Arctic fjords vs Barents Sea.
- (2023). Hidden in Plain Sight – New Insights on Arctic Sea-Ice Ridges from the MOSAiC Expedition – an Overview.
- (2022). ARCTIC SEA ICE RIDGES – DYNAMIC HOTSPOTS FOR MICROBIAL LIFE.
- (2020). Interactions between the filter-feeding appendicularian Oikopleura dioica and the abundance and fate of marine viruses.
- (2017). from light to dark and shallow to deep: Metagenomic analysis of total virus assemblages from arctic seawater provides a first glance of season- and depth-driven virus diversity and dynamics.
- (2017). Synechococcus in the Arctic Ocean.
- (2017). Protist community structure in Atlantic Arctic through the year as revealed by high throughput sequencing.
- (2017). Protist community structure in Atlantic Arctic through the year as revealed by high throughput sequencing.
- (2017). Microbial Food web structure in a changing Arctic.
- (2017). Light and depth - main drivers of marine virus diversity and dynamics in the Arctic - Metagenomic analysis of total viral assemblages from surface to the deep .
- (2016). Role of appendicularians in aquatic viral ecology: particle trapping, ingestion and consequences for the marine microbial food web.
- (2016). Development of a semi-automated method for metagenomic characterization of total virus assemblages from seasonal high-latitude seawater samples.
- (2014). Diversity and seasonal dynamics of marine haptophytes and their viruses.
- (2013). Diversity and dynamics of marine haptophytes and their viruses.
- (2011). Geographic segregation and mechanisms of genetic evolution between coccolithovirus populations: a genomic study.
- (2008). Increased level of CO2 in the ecosphere may modify the structure of marine plankton.
- (2007). Virus in aquatic ecosystems: Who are they and what are they doing?
- (2007). Virus Ecology.
- (2007). Total numbers and activity of environmental airborne bacteria.
- (2006). The global role of viruses in bloom termination, biodiversity and marine ecology.
- (2006). Algal Viruses –a Diverse Group with Ecological Impact.
- (2005). X-ray microanalyses of bacteria at the single cell level: Does elemental composition of cells relate to activity and nutritional status of cells?
- (2005). Single cell analysis: X-ray microanalysis in TEM.
- (2005). Single cell analysis: X-ray microanalysis in TEM.
- (2005). Methods in viral ecology.
- (2005). An overview of algal viruses.
- (2004). Viral diversity in solar saltern.
- (2003). Vyer for Fremtiden?
- (2003). Counting and Characterization of Microalgae, Bacteria and Virus in Marine Ecosystems.
- (2002). Marine phytoplankton viruses - ecology, physiology and host virus interactions.
- (2002). Marine Phytoplankton Viruses-Ecology, Physiology and Host Virus Interactions.
- (2002). MICROALGAL VIRUS ECOLOGY.
- (2002). Large Algal Viruses, Characterization.
- (2000). Virus detection and enumeration using flow cytometry.
- (2000). Population dynamics in the virioplankton community during marine algal blooms.
- (2000). Persistent virus infection in marine phytoplankton.
- (2000). Isolation and characterization of two marine viruses infecting Chrysochromulina ericina and Pyramimonas orientalis.
- (2000). Is Virus Production in Marine Algae Cell-cycle Dependent?
- (2000). Infection of Micromonas pusilla (Prasinophyceae) by a dsRNA virus.
- (2000). Extracellular Release of DNA During High-Dose PBCV-1 Infection of Chlorella.
- (2000). Diversity and succession of algae, virus and bacteria in nutrient enriched seawater enclosures.
- (2000). Bacterial population dynamics and diversity after viral lysis of three different algal species.
- (2000). Bacterial population dynamics and diversity after viral lysis of three different algal species.
- (1999). Viral control of phytoplankton blooms.
- (1999). Phytoplankton Viruses - Ecology And Host Virus Interactions.
- (1999). Flow Cytometric Analysis Of Virus Infected Phytoplankton.
- (1999). Algal Viruses - Characterization of new viruses and Quantification by Flow Cytometry and Pulsefield Gelelectrophoresis.
- (1998). Isolates of marine bacteria: elemental content relates to growth conditions [poster].
- (1998). Enumeration of viruses in marine samples by flow cytometry [poster].
- (1998). Elevated production of dimethylsulfide resulting from viral infection of cultures of <EM>Phaeocystis pouchetii</EM>.
- (1998). Ecology of algal host-virus interactions.
- (1998). Ecology of Phaeocystis host-virus interactions.
- (1998). Ecology of <EM>Phaeocystis</EM> host-virus interactions.
- (1998). Detection of <EM>Phaeocytus</EM>-virus by PCR.
- (1998). Characterization of virus infected phytoplankton cells by FCN.
- (1998). Bacterial activity measured by different single-cell methods.
- (1998). Algevirus.
- (1998). A PCR approach to specific quantification of <EM>Phaeocytis</EM> virus.
- (1997). Viral impact on algal blooms.
- (1997). Trophic interactions controlling the diversity in pelagic microbial food webs.
- (1997). The marine microbial ecology revised.
- (1997). Hutchinson's paradox reversed? Is the bacterioplankton diversity lower than predicted by steady state models?
- (1996). Viral lysis and bacterivory as prokaryotic loss factors along a salinity gradient.
- (1996). Preliminary analysis of structural proteins and DNA of PpV-1, a large dsDNA virus which is infectious to Phaeocystis pouchetii.
- (1996). Oceanic Dimethyl sulphide: Elevated Production During Virus Infection of Phaeocystis pouchetii (Hariot) Lagerheim.
- (1996). Isolation of a virus infecting Phaeocystis pouchetii (Haptophyceae).
- (1996). Bacterial population dynamics in a meromictic lake Sælenvatnet.
- (1995). Quantitative analysis of carbon, nitrogen, oxygen and phosphorous in single bacteria by use of X-ray - TEM.
- (1995). Analytical use of Transmission Electron Microscope (TEM) in aquatic microbial ecology.
- (1995). Algevirus - kontrollerer de oppblomstringer?
- (1993). Virus and the Microbial Loop, Paradigms and Paradoxes in the microbial loop.
- (1993). Decay and fate of aquatic viruses.
Editorial
- (2008). Global-scale processes with a nanoscale drive: the role of marine viruses. The ISME Journal. 575-578.
Book review
- (2016). Microbial Oceanography. Viral strategies at sea. Nature. 454-455.
Compendium
- (2001). BIO 101 Basal Biologi Laboratorieøvelser i Cellebiologi.
- (1997). Program and group reports from course in Microbial activity and diversity in aquatic interphases.
Doctoral dissertation
- (2017). Microbial dynamics in high latitude ecosystems. Responses to mixing, runoff and seasonal variation a rapidly changing environment.
- (1988). Production, amount and fate of bacterial biomass in marine waters : a discussion of field methods and results in a laboratory perspective.
Interview
- (2001). Stråler algene til døde.
Documentary
- (2018). Samler alger, bakterier og virus. Blogg: Arven etter Nansen.
Academic chapter/article/Conference paper
- (2008). Aquatic phage ecology.
- (2003). X-ray microanalysis of native aquatic bacteria. 7 pages.
- (1993). Total Counts of Viruses in Aquatic Environments.
- (1993). Microscope methods for measuring bacterial biovolume: epifluorescence microscopy, scanning electron microscopy and transmission electron microscopy.
Academic literature review
- (2023). Still Arctic? — The changing Barents Sea. Elementa: Science of the Anthropocene. 1-62.
- (2018). Simple models combining competition, defence and resource availability have broad implications in pelagic microbial food webs. Ecology Letters. 1440-1452.
More information in national current research information system (CRIStin)
ISI statistics (January, 2018): Articles: 77, Citations: >7000, h-index: 42
2020-24 CoPI: AQUACOSM-plus - Network of Leading Ecosystem Scale Experimental AQUAtic MesoCOSM Facilities Connecting Rivers, Lakes, Estuaries and Oceans in Europe and beyond
2019-23 CoPI: SIMPLEX - Exploring fractality in ecosystem organization – Developing scale-invariant theory for biodiversity and complexity based on simple laws of ecology.
2019-23 CoPI: VirVar - Uncovering key players for regulation of phytoplankton function and structure: lessons to be learned from algal virus-haptophyte coexistence.
2019-22 CoPI: Ridges - Safe Havens for ice-associated Flora and Fauna in a Seasonally ice-covered Arctic Ocean.
2018-23 Partner: The Nansen Legacy - scientific exploration and sustainable management beyond the ice edge.
2018-21 Partner: MIXsTRUCT - Impact of MIXotrophs on the sTRUCTure of the marine pelagic food web.
2018-21 Partner: VIROVAC: Filter-feeding mesozooplankton as uncharted accomplices in marine virus ecology.
2016-20 CoPI: Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean - AQUACOSM (H2020-INFRAIA, ca 770 to UIB).
Cand. real. 1981
Dr. philos. 1988
Fields of competence